So far I'm very happy with every single Sig that I have. Some guns I consider selling and/or trading but I will never get rid on my Sigs. This last summer I did a little experiment where I didn't clean my 220 starting from June and all the way to September while shooting almost every weekend. I used mixture of white box, federal, magtech and agulia, easily about 2300 rounds. Not a single FTE, FTF or any other malfunction. Only hiccup I had is where my slide didn't lock back on empty because I was using old ACT mag.
Now I'm looking to get one of their rifles, 556 patrol to be specific. I like the idea that its a gun that was designed around the piston platform and not the other way around.